Flick - Grow your Instagram with quality hashtags
Tagsdock - Tag Instagram photos instantly from your iOS keyboard.
Hashtagger - Hashtagger is an exciting platform that allows you to generate popular hashtags for Instagram.
Hashtag Suggestions for Instagram - Find the best hashtags for every photo
Friski - Search your Instagram posts
Curate App - Maximizing your reach by using hashtags on Instagram is hard to get right. Get your hashtag boost without spending the time with Curate.